var gulp         = require('gulp');
var concat       = require('gulp-concat');
var sort         = require('gulp-sort');
var minify       = require('gulp-minify');
var plumber      = require('gulp-plumber');
var istanbul     = require('gulp-istanbul');
var mocha        = require('gulp-mocha');
var watch        = require('gulp-watch');
var preprocessor = require('gulp-c-preprocessor');
var inject       = require('gulp-inject-string');
var replace      = require('gulp-string-replace');

gulp.task(
    'merge',
    function() {

        var d = new Date();
        var __DATE__ = JSON.stringify(d.toString());
        console.log("Compiling start at", __DATE__);

        var __EXTENDS__ = "";
        return gulp.src('./src/r3-*.js')
            .pipe(sort())
            .pipe(concat('r3.js'))
            .pipe(
                inject.prepend(
                    "// COMPILE TIME DEFINITIONS (Generated via gulp) \n" +
                    "var __DATE__ = " + __DATE__ + "; \n" +
                    "// END COMPILE TIME DEFINITIONS \n \n"
                )
            )
            .pipe(
                replace(new RegExp('R3.D3.Utils.Extend\\(.*?\\);', 'g'), function (replacement) {
                    __EXTENDS__ += replacement + "\n";
                    return "//" + replacement;
                })
            )
            .pipe(
                inject.append(
                    "\n//EXTENDS\n"
                )
            )
            .pipe(
                replace(
                    "//EXTENDS", function() {
                        return "//EXTENDING INTERFACES (Generated via gulp) \n" + __EXTENDS__ + "//END EXTENDING";
                    }
                )
            )
            .pipe(minify({
                ext:{
                    src:'.js',
                    min:'-min.js'
                }
            }))
            .pipe(gulp.dest('./build/'));
    }
);

gulp.task('test-prepare', function(){
    return gulp.src('./build/r3.js')
        .pipe(plumber())
        .pipe(istanbul())
        .pipe(istanbul.hookRequire())
        .on('end', function(){
            console.log('prepared the game lib for code coverage');
        });
});

gulp.task(
    'test',
    ['merge', 'test-prepare'],
    function() {
        gulp.src('./test/test.*.js')
            .pipe(sort())
            .pipe(plumber())
            .pipe(mocha({reporter: 'spec'}))
            .pipe(istanbul.writeReports({
                dir: './build/coverage'
            }))
            .pipe(istanbul.enforceThresholds({thresholds:{global:1}}))
            .on('error',
                function(error) {
                    console.log('plugin error occurred' + error);
                }
            )
            .on('end',
                function() {
                    console.log('test task ended')
                }
            );
    }
);


gulp.task('compileRuntime', ['merge'],
    function() {
        gulp.src(['./defines/runtime.js', './build/r3.js'])
            .pipe(concat('r3-runtime.js'))
            .pipe(preprocessor(
                {
                    // End of line character
                    endLine: '\n',

                    // Escape '//#' & '/*#' comments (see extra/comments)
                    commentEscape: true,

                    // Empty lines to add between code and included files
                    includeSpaces: 0,

                    // Limit of empty following lines (0 = no limit)
                    emptyLinesLimit: 0,

                    // Base path for including files
                    basePath: './',

                    // Stop the compiler when an error ocurred ?
                    stopOnError: true,

                    // Constants in #enum command must be in hexadecimal ?
                    enumInHex: true

                })
            )
            .pipe(minify({
                ext:{
                    src:'.js',
                    min:'-min.js'
                }
            }))
            .pipe(gulp.dest('./build/'));
    }
);

gulp.task('compileEditor', ['merge'],
    function() {
        gulp.src(['./defines/editor.js', './build/r3.js'])
            .pipe(concat('r3-editor.js'))
            .pipe(preprocessor(
                {
                    // End of line character
                    endLine: '\n',

                    // Escape '//#' & '/*#' comments (see extra/comments)
                    commentEscape: true,

                    // Empty lines to add between code and included files
                    includeSpaces: 0,

                    // Limit of empty following lines (0 = no limit)
                    emptyLinesLimit: 0,

                    // Base path for including files
                    basePath: './',

                    // Stop the compiler when an error ocurred ?
                    stopOnError: true,

                    // Constants in #enum command must be in hexadecimal ?
                    enumInHex: true

                })
            )
            .pipe(minify({
                ext:{
                    src:'.js',
                    min:'-min.js'
                }
            }))
            .pipe(gulp.dest('./build/'));
    }
);

gulp.task(
   'build',
    [
        'merge'
    ],
    function() {

    }
);


gulp.task(
    'default',
    [
        'merge'
    ],
    function() {
        return watch([
                'src/*.js'
            ],
            function() {
                gulp.start([
                    'merge'
                ]);
            })
    }
);